Potash Feldspar (Potclays 3426)
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Feldspars and stones
- Formula
- SiO₂ 73.63%, Al₂O₃ 13.85%, Fe₂O₃ 0.21%, CaO 0.15%, Na₂O 0.42%, K₂O 10.46%, MgO 0.08%, TiO₂ 0.1%, LOI 1.1%
- Also called
- Potash Feldspar, Potclays 3426
- Sold in
- UK
- Similar materials
- Potash Feldspar (Valentine Clays) , G-200 EU Feldspar , Mahavir Potash Feldspar
- Source
- Potclays 'Potash Feldspar' product page, chemical analysis (XRF) typical %
Potclays' potash feldspar: almost no soda and extra free silica, so it has less alumina than most potash spars. Values are midpoints of the published ranges.
Oxide analysis and unity formula
Glazecalc has the analysis of Potash Feldspar (Potclays 3426) as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Potash Feldspar (Potclays 3426) that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| SiO₂ | 73.63 | 10.005 |
| Al₂O₃ | 13.85 | 1.109 |
| Fe₂O₃ | 0.21 | 0.011 |
| CaO | 0.15 | 0.022 |
| Na₂O | 0.42 | 0.055 |
| K₂O | 10.46 | 0.907 |
| MgO | 0.08 | 0.016 |
| TiO₂ | 0.1 | 0.010 |
- Equivalent weight
- 816.44
- Fired weight
- 807.46
- Loss on ignition
- 1.1%
The equivalent weight is the grams of Potash Feldspar (Potclays 3426) that hold 1.0 mole of flux. The fired weight is what is left of that after firing.
Hazards and safety
Hazards: Fine dust contains respirable crystalline silica; avoid breathing it.
Use it in a recipe
Add Potash Feldspar (Potclays 3426) to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.